I've been running through Pragmatic Studio's Live View course, which I highly recommend, and wanted to make a specific note of how to authenticate users when writing Live View tests after adding phx_gen_auth to a Phoenix project.
Happily, this is a very short post, because phx_gen_auth does all the work for you. When you've run that generator, you get a function added to your conn_case.ex called register_and_log_in_user. This function takes a map with a connection in it, creates a new user, logs the user in, and returns it with a modified connection.
So now my test that used to fail because the page now requires authentication:
test "saves new message", %{conn: conn} do
{:ok, index_live, _html} = live(conn, Routes.message_index_path(conn, :index))
assert index_live |> element("a", "New Message") |> render_click() =~
"New Message
--------
** (MatchError) no match of right hand side value: {:error, {:redirect, %{flash: "SFMyNTY.g2gDdAAAAAFtAAAABWVycm9ybQAAACRZb3UgbXVzdCBsb2cgaW4gdG8gYWNjZXNzIHRoaXMgcGFnZS5uBgCMD68zeQFiAAFRgA.zriUcbZsaCi0a4Bqq-hpJK0WP8IH-MHusGt3DPw028g", to: "/users/log_in"}}}
Will pass if I just call that function at the front:
test "saves new message", %{conn: conn} do
# 🚨 Add this line to authenticate the test request.
%{conn: conn} = register_and_log_in_user(%{conn: conn})
{:ok, index_live, _html} = live(conn, Routes.message_index_path(conn, :index))
assert index_live |> element("a", "New Message") |> render_click() =~
"New Message
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